Preclinical dosimetric estimation of [¹¹¹In] 5, 10, 15, 20-tetra phenyl porphyrin complex as a possible imaging/PDT agent

Introduction: Recent studies show that porphyrin derivatives have interesting pharmacological and photodynamic properties andwide range of usage in photodynamic therapy treatment. This study describes the preparation, biodistribution and absorbed doseprediction of [<jats:sup/>111In] labeled 5, 10, 15, 20-tetra phenyl porphyrin (TPP) in human organs, based on rats' biodistributiondata. Methods: Five rats were sacrificed at each exact time intervals (2, 4 and 24 h post injection) and thepercentage of injected dose per gram of each organ was measured by direct counting from rats data from 12 harvested organs. The MedicalInternal Radiation Dose (MIRD) formulation was applied to extrapolate from rats to human and to project the absorbed radiation dose forvarious organs in humans. Results: From rat data we estimated that injection of [<jats:sup/>111In] TPP into the humans wouldresult in an estimated effective absorbed dose of 0.09 mSv/MBq in the whole body. While the highest effective absorbed dosefor <jats:sup/>111In-TPP was in the heart wall (0.22 mSv), the organs that received the next highest doses were the Kidneys(0.06 mSv), thymus (0.04 mSv) and lungs (0.03 mSv). Conclusions: The skin dose will fourtimes higher compare to the other <jats:sup/>111In compounds, which was due to magnificent skin uptakes. According to the fastwash-out, tumor avidity and the short half-life, [<jats:sup/>111In] can be a suitable candidate for labeling of photo dynamic therapy(PDT) agents as a tracer for accurate biological evaluation of other PDT agents such as Photofrin and its homologs.